Just discovered Amazon subscriptions, where you get a cheaper price for items if you 'subscribe'. However there doesn't seem to be any restriction on cancelling subscriptions So buy your item at the cheaper subscription price, once delivered cancel the subscription. I dont bother if its pence different, but when its pounds worth doing.
E.g.
https://www.amazon.co.uk/gp/aw/d/B00...b_b_prod_image
6 bottles of drinkable Aussie plonk. £38 , but £34 if subscribing, plus there's £9.54 discount voucher. So around £24 for 6 bottles. Just ordered my 2nd case. Cheers